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If you plan to use the parallel port Debug Server "PARSERV" or "PARSERVW", a
cable must connect the parallel ports of the two computer systems.  Three
cabling methods are supported - the LapLink cable, the Flying Dutchman
cable, and WATCOM's own design.  There are two advantages to using the
LapLink or Flying Dutchman cable:

 1. They are commercially available (you may already own one).

 2. They may work with more PC "compatibles" than WATCOM's cable.  WATCOM's
    cabling requires 8 bi-directional data lines in the parallel port and
    some PC "compatibles" do not support this.

The disadvantage with the LapLink and Flying Dutchman cables is that they
are slower than WATCOM's cable since only 4 bits are transmitted in parallel
versus 8 bits for WATCOM's.  Thus WATCOM's cable is faster but it will have
to be custom made.

The LapLink cable is available from:


     Travelling Software, Inc.
     18702 North Creek Parkway
     Bothell, Washington,
     U.S.A. 98011
     Telephone: (206) 483-8088

The Flying Dutchman cable is available from:


     Cyco,
     Adm. Banckertweg 2a,
     2315 SR Leiden,
     The Netherlands.

The following diagram illustrates WATCOM's cable wiring between the two
parallel ports.


        Task Machine       Debugger Machine
     Parallel Connector   Parallel Connector

          Pin Number         Pin Number
              1 <--------------> 2
              2 <--------------> 1
              3 <--------------> 14
              4 <--------------> 16
              5 <--------------> 15
              6 <--------------> 13
              7 <--------------> 12
              8 <--------------> 10
              9 <--------------> 11
             10 <--------------> 8
             11 <--------------> 9
             12 <--------------> 7
             13 <--------------> 6
             14 <--------------> 3
             15 <--------------> 5
             16 <--------------> 4
             17 <--------------> 17
             18 <--------------> 18

Figure 26. WATCOM Cable Wiring Scheme

The following diagram illustrates the LapLink cable wiring between the two
parallel ports.


        Task Machine       Debugger Machine
     Parallel Connector   Parallel Connector

          Pin Number         Pin Number
              2  --------------> 15
              3  --------------> 13
              4  --------------> 12
              5  --------------> 10
              6  --------------> 11
             10 <--------------   5
             11 <--------------   6
             12 <--------------   4
             13 <--------------   3
             15 <--------------   2
             25 <--------------> 25

Figure 27. LapLink Cable Wiring Scheme

The following diagram illustrates the Flying Dutchman cable wiring between
the two parallel ports.


        Task Machine       Debugger Machine
     Parallel Connector   Parallel Connector

          Pin Number         Pin Number
              1  --------------> 11
              2  --------------> 15
              3  --------------> 13
              4  --------------> 12
              5  --------------> 10
             10 <--------------   5
             11 <--------------   1
             12 <--------------   4
             13 <--------------   3
             15 <--------------   2

Figure 28. Flying Dutchman Cable Wiring Scheme

For the IBM PC and PS/2, the connectors are standard "male" DB-25
connectors.  Note that, in all cases, the wiring is symmetrical (i.e.,
either end of the cable can be plugged into either PC).

+--------------------------------------------------------------------------+
|   Note:  Although the wiring is different for all three cables, WATCOM's |
| parallel communications software can determine which one is in use.      |
+--------------------------------------------------------------------------+